<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-if指令</title>
</head>
<body>
    <div id="app">
        <input type="button" value="切换显示" @click="toggleIsShow">
        <p v-if="isShow">黑马程序员</p>
        <p v-show="isShow">黑马程序员 -v-show</p>
        <h2 v-if="tem>35">热死啦</h2>
    </div>
         <!-- 开发环境版本，包含了有帮助的命令行警告 -->
         <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"> </script>

         <script>
         var app = new Vue({
         el: '#app',
          data: {
            isShow:false,
            tem:40
    },
        methods:{
            toggleIsShow:function(){
                this.isShow=!this.isShow;
            }
        }
    })
     </script>
</body>
</html>